JP2894677B2 - Length reference - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a length standard for checking the accuracy of a length measuring instrument such as a micrometer or a height gauge.

[0002]

2. Description of the Related Art A block gauge (Johanson block) has been often used as a length standard used for accuracy inspection of a micrometer or the like. However, when there are many types of measuring instruments to be checked and the measuring range is different even for the same measuring instruments, it takes a lot of trouble to check the accuracy of each of them using a block gauge.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a length reference device capable of inspecting the accuracy of various types of measuring instruments having a wide measuring range.

[0004]

The length standard of the present invention comprises a plate that stands on a base. The upper part of the plate is formed in a step shape, and each step of the step is a height measuring surface based on the lower surface of the base. A pair of left and right horizontal distance measurement surfaces is formed on the falling portion from each step and on the opposite side of the plate. Each horizontal distance measurement surface protrudes in the left-right direction.

[0005] A series of steps with different heights may be formed on at least one step surface of the stairs for dial gauge measurement.

[0006]

An embodiment of the present invention will be described with reference to the drawings. The plate 2 is mounted upright on the base 1. Both the base and the plate are made of steel. The plate 2 has an upper side formed in a step shape, and an upper surface 3 of each step of the step.
Is the height measurement surface. H _{1 to} H ₄ are reference dimensions from the lower surface of the base to each measurement surface 3.

A pair of left and right horizontal distance measuring surfaces 5 and 6 are formed on the falling portion from each step and on the opposite side of the plate. Concave portions 7 and 8 are formed below the measurement surfaces 5 and 6 so that the horizontal distance measurement surfaces 5 and 6 project in the left-right direction. M _{1 to} M ₅ are reference dimensions between the horizontal distance measurement surfaces 5 and 6. The bottoms of the recesses 7 and 8 are also finished as horizontal distance measurement surfaces. N ₁ to N ₅ is the reference dimension between the left and right recesses.

As shown in detail in FIG. 3, a series of steps A having slightly different heights is formed at the bottom. As a base point to the center of the stage 9, step _{D 1, D 2, D 3} , D 4 and T _1, T _2, T ₃ to each stage it is in the reference dimension.

Each of the reference dimensions H _{1 to} H ₄ , M _{1 to} M ₅ , N _{1 to} N ₅ , D ₁ to
D ₄ and T ₁ through T ₃ is previously measured with a high precision instrument. With the use will be described, the outer micrometer actually measured select those commensurate with the measurement range from the reference dimension M ₁ ~M _5, obtains the difference between the reference dimension is previously precisely measured. To determine the instrumental difference in this way, the anvil and spindle of the micrometer are applied to the center of the measuring surfaces 5 and 6 (position a in FIG. 4). If the anvil and the spindle are applied to the ends of the measuring surfaces 5 and 6 instead of the center as shown in FIGS.
The parallelism of the tip surface of the spindle can also be checked. Figure
In FIG. 2 , the state where the anvil and the spindle were applied in the d state is indicated by a chain line.

The caliper is, like the micrometer,
It may be tested for accuracy by measuring the reference dimension M ₁ ~M _5. However, since there is a risk that damage the measurement surfaces 5 and 6 was finished with high precision micrometer, to determine a instrumental error measure the reference dimension of the N ₁ to N _5. Accuracy inspection of a height gauge, use any of the standard dimensions of H ₁ to H _4. The dial gauge adjusts the zero point at the base point 9 and sequentially measures the steps D _{1 to} D ₄ to obtain the accuracy over a wide range. Subsequently, the return error is obtained by returning from D _{4 to} D ₁ to the base point 9. The lever type dial gauge performs the same measurement using steps T1 to T3.

[0011]

According to the length standard of the present invention, the upper portion of the plate is formed in a step shape, and each step of the step is a height measuring surface with reference to the lower surface of the base. A pair of left and right horizontal distance measuring surfaces are formed on the falling portion and on the opposite side of the plate, and the accuracy of three types of measuring instruments, a micrometer, a caliper, and a height gauge, can be easily and quickly inspected. This has the effect of reducing man-hours required for accuracy inspection. In addition, since each horizontal distance measurement surface protrudes in the left-right direction, the parallelism of the micrometer can be checked by contacting the anvil and the spindle of the micrometer with the end of the measurement surface instead of the center. In addition, each horizontal distance measurement plane
The bottom of the recess provided at the bottom also forms the horizontal distance measurement surface.
Therefore, if you use this to measure the caliper,
The horizontal distance measurement surface finished with high precision for
You don't have to.

A series of steps having different heights is formed on the upper surface of at least one step of the steps, and
The part has a step (9) as a base point, so that the base point is
Inspection of dial gauges and lever type dial gauges
Can also be performed together.

[Brief description of the drawings]

FIG. 1 is a perspective view of a length reference device.

FIG. 2 is a front view of a length reference device.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a left side view of the length reference device.

[Explanation of symbols]

 1 Base 2 Plate 3 Height measurement surface 5 Horizontal distance measurement surface 6 Horizontal distance measurement surface A Step

Claims (2)

(57) [Claims] 1. A base (1) and a plate (2) standing thereon, wherein the upper part of the plate is formed in a step shape, and each step of the step is a height measuring surface with reference to the lower surface of the base. (3) and turned, the trailing portion and on the opposite side of the plate and the horizontal distance measuring surface of the right-and-left (5,6) are formed, each horizontal distance measured from each step
Concave portions 7 and 8 are formed below the surface (5, 6) to
The separation measurement surfaces (5, 6) are projected in the left-right direction.
And the bottom surfaces of the recesses (7, 8) also serve as horizontal distance measurement surfaces.
Forming length reference. 2. A series of steps (A) having different heights in the form of steps on the upper surface of at least one step of the steps .
The length standard according to claim 1, wherein the step comprises a step (9) as a starting point .